Boeing 737 Classic

Boeing 737 Classic
Name	Boeing 737 Classic
Caption	A Boeing 737-300 in flight.
Type	Narrow-body airliner
National origin	United States
Manufacturer	Boeing Commercial Airplanes
First flight	24 February 1984
Introduction	28 November 1984 with USAir
Status	In limited service
Primary users	Southwest Airlines (historical), Ryanair (historical), Alaska Airlines (historical), Delta Air Lines (historical)
Produced	1981–2000
Number built	1,988
Developed from	Boeing 737 Original
Developed into	Boeing 737 Next Generation

Boeing 737 Classic is the series name for the -300, -400, and -500 models of the Boeing 737, which were produced from 1981 to 2000. Developed as a modernized successor to the original Boeing 737-200, the Classic series incorporated advanced CFM International CFM56 turbofan engines, a redesigned wing, and an updated flight deck. These improvements offered significant gains in fuel efficiency, range, and passenger capacity, cementing the Boeing 737's position as a best-selling jet airliner and competing directly with the Airbus A320 family.

Development and design

The program was launched in March 1981 following pressure from airlines like USAir and Frontier Airlines for a more efficient aircraft to replace older McDonnell Douglas DC-9 and Boeing 727 models. The key innovation was the integration of the CFM International CFM56-3 high-bypass turbofan, which required a redesigned nacelle and a longer landing gear to maintain ground clearance. Engineers, including chief designer Joe Sutter, extended the fuselage for the -300 model and incorporated elements from the Boeing 757 and Boeing 767, such as a modernized avionics suite with EFIS displays. The wing was modified with new wingtip devices, improving the lift-to-drag ratio and overall aerodynamic efficiency.

Variants

The initial 737-300, the most popular variant, typically seated 128 to 149 passengers and first flew in 1984 with launch customer USAir. Responding to demands from Delta Air Lines and Piedmont Airlines for higher capacity, Boeing introduced the stretched 737-400 in 1988, which added a 10-foot fuselage plug forward of the wing and another aft, increasing seating to around 170. Conversely, the shortened 737-500, launched in 1987 for Southwest Airlines and Britannia Airways, offered a longer range with up to 132 seats, directly replacing the Boeing 737-200 on thinner routes while providing commonality with the larger Classics.

Operational history

The 737 Classic entered service with USAir in late 1984 and quickly became a mainstay for major carriers worldwide, including Southwest Airlines, Lufthansa, and Ryanair, which used it to pioneer its low-cost model in Europe. Its efficiency made it a favorite for both high-frequency domestic routes in the United States and medium-haul international flights. Production ended in 2000 after 1,988 aircraft were delivered, with final assemblies rolling out from Boeing's Renton, Washington facility. While largely retired by major operators in favor of the Boeing 737 Next Generation and Boeing 737 MAX, many remain in service with smaller airlines and cargo operators like ASL Airlines Ireland.

Accidents and incidents

The operational history includes several notable accidents that prompted safety improvements. The crash of USAir Flight 427 near Pittsburgh in 1994, attributed to a rudder control system malfunction, led to a lengthy National Transportation Safety Board investigation and eventual redesign of the servo valve. Similarly, the loss of SilkAir Flight 185 over the Musi River in 1997 and the controlled flight into terrain of Kazan Airlines Flight 363 in 2013 highlighted ongoing issues with pilot training and TAWS implementation. These events contributed to enhanced flight crew procedures and stricter Federal Aviation Administration mandates on aircraft systems.

Specifications

{| class="wikitable" |- ! Variant ! 737-300 ! 737-400 ! 737-500 |- | Cockpit crew | colspan="3" | Two |- | Seating capacity | 149 (1-class) | 168 (1-class) | 132 (1-class) |- | Length | 33.4 m (109 ft 7 in) | 36.5 m (119 ft 7 in) | 31.0 m (101 ft 9 in) |- | Wingspan | colspan="3" | 28.9 m (94 ft 9 in) |- | Max takeoff weight | 63,300 kg (139,500 lb) | 68,100 kg (150,000 lb) | 60,600 kg (133,500 lb) |- | Engines (×2) | colspan="3" | CFM International CFM56-3 |- | Range | 4,204 km (2,255 nmi) | 3,862 km (2,085 nmi) | 4,444 km (2,400 nmi) |- | Cruise speed | colspan="3" | Mach 0.74 (789 km/h, 490 mph) |}

Legacy and influence

The 737 Classic series successfully bridged the gap between the original Boeing 737 and the subsequent Boeing 737 Next Generation, proving the viability of the high-bypass turbofan on a narrow-body aircraft and solidifying the CFM International partnership. Its commercial success pressured rival Airbus and accelerated the development of the Airbus A320 family, intensifying the duopoly in the single-aisle market. The design lessons and manufacturing processes directly informed the more advanced Boeing 737 Next Generation, ensuring the longevity of the Boeing 737 lineage, which continues today with the Boeing 737 MAX.

Category:Boeing 737 Category:Aircraft first flown in 1984 Category:Twinjets